/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.commons.service;

import org.apache.iotdb.commons.conf.IoTDBConstant;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.management.*;
import java.lang.management.ManagementFactory;

public class JMXService implements IService {

    private static final Logger logger = LoggerFactory.getLogger(JMXService.class);

    public JMXService() {
        // Empty constructor
    }

    /**
     * function for registering MBean.
     */
    public static void registerMBean(Object mbean, String name) {
        try {
            MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
            ObjectName objectName = new ObjectName(name);
            if (!mbs.isRegistered(objectName)) {
                mbs.registerMBean(mbean, objectName);
            }
        } catch (MalformedObjectNameException
                | InstanceAlreadyExistsException
                | MBeanRegistrationException
                | NotCompliantMBeanException e) {
            logger.error("Failed to registerMBean {}", name, e);
        }
    }

    /**
     * function for deregistering MBean.
     */
    public static void deregisterMBean(String name) {
        try {
            MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
            ObjectName objectName = new ObjectName(name);
            if (mbs.isRegistered(objectName)) {
                mbs.unregisterMBean(objectName);
            }
        } catch (MalformedObjectNameException
                | MBeanRegistrationException
                | InstanceNotFoundException e) {
            logger.error("Failed to unregisterMBean {}", name, e);
        }
    }

    @Override
    public ServiceType getID() {
        return ServiceType.JMX_SERVICE;
    }

    @Override
    public void start() {
        String jmxPort = System.getProperty(IoTDBConstant.IOTDB_JMX_PORT);
        if (jmxPort == null) {
            logger.debug("{} JMX port is undefined", this.getID().getName());
        }
    }

    @Override
    public void stop() {
        // do nothing.
    }
}
